New unvented hot water cylinder in an airing cupboard

Hot water cylinders · Unvented and vented

Unvented hot water cylinders in Andover

Mains pressure hot water from an unvented cylinder, or a like for like swap for a tired old tank. Priced after a quick look.

Ask about a cylinder 07774 319391

5.0 on Google from 63 reviews · Gas Safe and OFTEC registered

How much does an unvented cylinder cost to fit?

Cylinder jobs are priced after a quick look, because the size of cylinder, its position and the pipework all change the cost. Send the form or a photo of your current cylinder and Dexter gives you a fixed price.

Call 07774 319391 or WhatsApp Dexter.

Price

Fixed price after a quick look

Priced after a quick look, from a photo or a short visit.

What affects the price

Unvented or vented cylinder
The size of cylinder your home needs
How much pipework needs changing
The route for the discharge pipe
Removing loft tanks

How long it takes. A cylinder replacement usually takes a day. Dexter can often keep you with some hot water while the work is done, as one review below describes.

Stelflow unvented cylinder on the DWM mat, a DWM job in the Andover area — Stelflow unvented cylinder on the DWM mat

About this job

An unvented cylinder stores hot water at mains pressure, so showers are strong and several taps can run at once without the flow dropping. It suits larger homes with more than one bathroom, where a combi might struggle, and it removes the need for a cold water tank in the loft.

Dexter fits unvented cylinders, replaces old vented cylinders like for like, and repairs immersion heaters, thermostats and valves. Unvented cylinders need an engineer qualified to install them and a yearly check, and Dexter registers the installation and talks you through how it works.

If you would rather do without a cylinder altogether, a combi conversion may suit your home better. Dexter will tell you which option makes more sense.

Unvented cylinder with the DWM sticker, a DWM job in the Andover area — Unvented cylinder with the DWM sticker

What a cylinder installation covers

Old cylinder drained and removed
New unvented or vented cylinder fitted
Pipework rerouted to suit
Safety valves, expansion vessel and discharge pipe fitted
Immersion heater and controls wired
Commissioned and the installation registered

Signs you need a new cylinder

Weak showers or low pressure at the taps
Hot water runs out quickly
The cylinder is leaking or corroded
The immersion heater keeps failing
You want to remove the loft tanks

How it works

No call centre and no sales visit. The person you speak to is the person who does the job.

1Send the form or a photo
Show Dexter your current cylinder and tell him what you would like.
2A fixed price
He recommends the right cylinder and gives you a fixed price.
3Fitted and registered
The cylinder is fitted, commissioned and registered, and he explains how it works.

Dexter's own photos

Real jobs, photographed by Dexter. No stock pictures.

Mega unvented cylinder in a cupboard
Unvented cylinder in a cupboard
Tall unvented cylinder with copper pipework
Unvented cylinder with its expansion vessel

What customers say

5.0 on Google from 63 reviews. Read them all on Google

★★★★★

Fitted a new unvented cylinder. Removed our very old failing vented system and re-routed pipework accordingly. Cleared out the old system and left the place very tidy each day. Ensured the work fitted to my schedule and even left us with availability of hot water (via the immersion) throughout the work. Did a lovely job and Dexter was very helpful and knowledgeable. Great work ethic and a nice chap too. ...

Philip EwenGoogle review, August 2024

★★★★★
I highly recommend Dexter for any plumbing or heating jobs. I phoned him to help me sort out my immersion heater and he came within a couple of hours, diagnosed the problem, ordered the part I needed and then installed it within and hour after the part was delivered to my house. ...
Gus WehbehGoogle review, July 2024
★★★★★
Had lots of work carried out by Dexter. Including radiator installs, vented cylinder installation, boiler service, toilet repairs. Very knowledgeable, very clean and works efficiently. Would highly recommend him to anyone needing any plumbing/heating works
Craig GouldingGoogle review, August 2026
★★★★★
Dexter replaced our old vented heating system and hot water cylinder with a new combi in our loft, including a new gas run from our garage. Dexter is extremely polite, tidy and his work is first class. Turned up on time and worked hard to finish the job on schedule. ...
Dean ChappellGoogle review, April 2025

Questions

Hot water cylinders:
your questions

Not sure what boiler you have? Send Dexter a photo and he will tell you.

WhatsApp Dexter

What is the difference between vented and unvented?

A vented cylinder is fed from a tank in the loft and runs at low pressure. An unvented cylinder is fed straight from the mains and gives mains pressure hot water.

Is my water pressure good enough for an unvented cylinder?

Dexter checks your mains pressure and flow first. Unvented cylinders need a good mains supply to work well.

Do unvented cylinders need servicing?

Yes. They should be checked every year to make sure the safety valves are working.

Can you repair my immersion heater?

Yes. Dexter repairs and replaces immersion heaters, thermostats and cylinder valves.

Ask Dexter about hot water cylinders

Send the short form and Dexter rings you back himself. Or call 07774 319391 or send a WhatsApp.

Gas Safe and OFTEC registered · 5.0 on Google from 63 reviews · Based in Andover, covering Hampshire and Wiltshire